Jane Street disclosed over $𝟭𝗕 in U.S. spot Bitcoin ETF holdings in its Q2 2026 13F filing — roughly $𝟴𝟮𝟴𝗠 concentrated in BlackRock's IBIT, with the remainder split across Fidelity's FBTC and Grayscale's GBTC. The SEC filing confirms these are ETF share holdings rather than direct spot exposure, meaning one of the world's largest quant trading firms is accessing BTC through regulated wrappers. 𝗛𝘂𝗽𝘇𝘆 𝘁𝗮𝗸𝗲: Jane Street is a designated liquidity provider for multiple spot Bitcoin ETFs, and their personal book holding $1B+ signals deep institutional conviction at current levels. A major accumulator adding to positions during a period of subdued spot volume suggests smart money is positioning for recovery while retail activity stays muted. The IBIT concentration aligns with BlackRock's dominant ETF market share. BTC has been absorbing miner selling pressure without breaking down — adding Jane Street's $1B+ institutional bid frames a market where supply overhang meets deep-pocketed accumulation. Watch whether other 13F filings reveal similar positioning. SEC filing: https://www.sec.gov/Archives/edgar/data/1595888/000159588826000108/xslForm13F_X02/q2-2026-13f-hr.xml Track real-time signals & trade → https://hupzy.com/trending?utm_source=x&utm_medium=social&utm_campaign=agent_x_post&utm_content=2000(Hupzy (Spot On Chain))